Speed indicator



` May '31, 1927.

1,630,963 F. MoR'rENsEN SPEED INDICATOR Filed .July 13; 1 926 l l f- Patented May v31, 1927.

UNITED STA-'rss FBANTZMORTENSEN, or. nnLsIivGroRsQrInLANn.

' srnnn INDICATOR.

Application flied .'ruiy'is; 192.6, serieu' No. 122,250, and in' Germany rely 1.7, 1925. n

- The use of speed indicators, giving a sound for each revolution` of a'revolving shaft until a certain speed is attained, isal-A ready known. n theconstruction' of sucli speed indicators however' the member creat ing the sound is generally-.lifted bytherd tation of the shaft andv drops in a certain position irrespective of the speedof the shaftr thereby creating a certain constant and disagreeable sound.

i sound otherwise created by the fall of the ball will be eliminated.

Thel drawing shows an example ofa speed indicator in accordancel withj the .present construction. i

indicator. Figure 2 shows the same section but with the ball'in a different position.

' Figures 3 and 4e show vertical-sections of,`v respectively, Figure l and Figure 2. Y 5 and 6 shows the indicator turned Figures v in different positions.

' The arrangement consists principally of aj revolving shaft a on which a bushing c is fixed. In connection with the cover d this bushing forms a channel g which' is closed in one end by means of a stopper v1 whereas the Y'other end is open so that the ball may slide out of the channeland strike against the;4

.een b. VThe beiiie exea-fe The present invention refers to a speed indicator in which the memberlfor instance` Figure 1 shows a section through the speed the Shea by e means of a screw 'The speed indicator worksias followsi-s f As long time as the speed is below a certain Vlimit the ballor the memberwhen'sliding in f the channel' will leave the channel on acfl countvof the comparatively low speed and strike against the bell ras shown in Figures Q and 4. As soon as the speed limitis attained ory exceededlthe memberwillnot leave *e the channel and consequently the sound will cease. Y f i The limit.l atwhichthe member will cease [to strike aga-inst the bell may bevaried conl Vsiderably either by altering thev height of the edge 7u shown in Figure 3 or by altering the 55 radius or the shape4 of thechannel or by ad- Y e justing the screw z'.

Claims.y j 1. Anvind-icator for indicating the speed of a revolving shaft` characterized*therebythat "6g a channel vin which a memberY for instance. a ballv moves when the shaft revolves, is

bent round theshaft lto lbe controlled and'y revolves with theshaftyand a resonant body' in the penev ef erleben, whereby the een ein 5;y 'f

strike against the resonant-body and` create Va sound for each revolutionrof the shaft` un-f til a ycertain@speed is attained. .Y 2. In a speed indicator for revolving shaft the combination with a shaft, ofa mem- 7 0v` ber xedly secured Vto the shaft and having a1 e f e. curved channelof even diameter throughout' f .and of a lengthto Iextend more than one half 'around the sliaft,said channel being open atone end, a. ball inthe chann'elfand 7'5"v a bell'secured to the'l shaft and disposed'in. the path ofl the ball..v i l f FRANTZ llORTENSEN, i

TENT 1 Fries. g 

